Process of making neutral soap.



UNITED STATES Patented April 4, 1.905.

PATENT OEEIcE.

PROCESS OF MAKING NEUTRAL SOAP.

SPECIFICATION forming part of Letters Patent No. 786,496, dated. April4, 1905.

Application filed September 8,19%. Serial No. 223,740.

To all whom it may concern:

Be it known that I, Auensr PAUL HORN, a

subject of the Emperorof Germany, residing at 26 Tappelallee, in thecity of Hamburg, Germany, have invented new and useful Iniprovements inProcesses for thePreparation of Soaps, of which the following is aspecification.

The present invention relates to a process for the preparation of soapswhich are not only themselves neutral, but remain neutral on hydrolysis.

The object of my invention is to neutralize any free alkali which maystill be present in the soap before use, and more especially to bind thealkali which is ordinarily set free from all soaps when they arehydrolyzed, and thus to annul the injurious solvent action whichordinary soaps, owing to the presence of free alkali, exert on the skin.

According to the process forming the subject of the present inventioncertain decomposition products of albuminous substances are added to theprimary components of the soap.

The following is the method of effecting the incorporation: Ordinaryalbuminous substances are first purified and freed from the adherentsalts by dialysis. The product thus obtained is then decomposed byexposing it while under pressure to the action of heat by treatment withacids or alkalies or by some other suitable process. The albumosesobtained by this decomposition have thesame structure and give the samecolor reactions as the native albuminous substances. Nevertheless theydiffer widely from the latter in many properties, viz: First, thealbumoses are not coagulable; second, their behavior toward the saltswhich are to be precipitated from them dilfers from that of the nativealbuminous substances; third, the albumoseacid salts formed withalkalies are much more stable when hydrolyzed than are alkalialbuminates,

and, fourth, the albumoses have a stronger acid reaction than native eg-white or albumen. In view of their above-recited properties thealbumose preparations are eminently adapted for the production of soapswhich remain neutral when hydrolyzed. The albumose preparations obtainedby the above-specified decomposition process are added to the soapingredientseitherduring the saponificationprocess or else subsequentlyduring the pilling operation. The soap thus produced is perfectlyneutral and remains so on hydrolysis, for the alkali which is therebyset free becomes fixed while in 8mm nascendc' as albumose-acid alkali.Hence the Water used in washing remains perfectly neutral-an effectwhich is not obtained with any other soap.

Through the formation of the albumoseacid salts of the alkali the latteris deprived of its detergent properties, so that by means of theabove-described process a soap is produced which is itself neutral andwhich remains so on hydrolysis.

The proportion of albumose preparation to be added to the raw materialswill depend on the percentage of alkali contained in the latter.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is- The herein-described process for the preparation ofneutral soap consisting in adding albumoses to the raw soap material andthen making soap from said material.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

AUGUST PAUL HORN.

Witnesses:

ALFRED J OSEPH, E. H. L. MUMMENHOFF.

